Both of Garza's leads turned out to be in the record. The Texas Supreme Court's 1944 opinion in State v. Balli cites a revoked will of the Padre dated November 4, 1811, then still in the Matamoros archives, and quotes him: he claimed the island's pasture as his property, said he had it surveyed and adjudicated, and kept a thousand head of cattle there — seventeen years before the will everyone cites.
The same opinion records that the heirs' original title papers were lost in November 1850 in the wreck of the steamer Anson out of Brazos Santiago. The 1811 will is now part of my request to Matamoros; the wreck is a new thread.
Sources: State v. Balli, 144 Tex. 195, 190 S.W.2d 71 (Tex. 1944) · UTRGV Special Collections, Ballí Family research guide (1996 translation of the 1811 will by J. T. Canales)